English

Cone theorem and Mori hyperbolicity

Algebraic Geometry 2022-12-27 v3

Abstract

We discuss the cone theorem for quasi-log schemes and the Mori hyperbolicity. In particular, we establish that the log canonical divisor of a Mori hyperbolic projective normal pair is nef if it is nef when restricted to the non-lc locus. This answers Svaldi's question completely. We also treat the uniruledness of the degenerate locus of an extremal contraction morphism for quasi-log schemes. Furthermore, we prove that every fiber of a relative quasi-log Fano scheme is rationally chain connected modulo the non-qlc locus.

Keywords

Cite

@article{arxiv.2102.11986,
  title  = {Cone theorem and Mori hyperbolicity},
  author = {Osamu Fujino},
  journal= {arXiv preprint arXiv:2102.11986},
  year   = {2022}
}

Comments

46 pages, v2: minor modifications, v3: revisions following referees' comments and suggestions

R2 v1 2026-06-23T23:27:21.352Z